Bony Fish

There are about 20,000 species of Bony Fishes and they all share these characteristics:

1. Skeleton is made of bone.2. Use gills to extract oxygen from water. 3. cold blooded -ectothermic-(get their body heat from their environment.)4. have a Swim Bladder for buoyancy in the water (it's a 3D environment after all. Want to experience it yourself? Visit Vashj'ir.)4. most lay eggs of some sort.

Class Chondrichthyes is in session! These cool cats are made up of about 970 living species (hmm.."living" species...does that mean there are "undead" species?) But let me speak more clearly ...I'm talking mother-effin' sharks. Oh, we so need these as hunter pets, please Blizzard, let me blow my whistle and summon seven rows of razor sharp teeth in my opponents face.

1. These guys (sharks, skates and rays) are different from Bony Fishes in that they have cartilage as the material making up their skeleton, as opposed to bone (like reptiles, birds, mammals and us). 2. These guys also do not have swim bladders (for buoyancy) or lungs - they control buoyancy with an over-sized liver, which is full of oil, which is less dense than water, and so gives a measure of vertical control in their environment. 3. To extract oxygen from the water they use Gills, usually 5-7 pairs of gill slits.4. Some lay eggs and some give live birth (viviparous).